Series compensation device MOV explosion-proof performance test system and method

Abstract

The invention discloses a series compensation device MOV explosion-proof performance test system and method. The system comprises an industrial personal computer and a test device in communication connection with the industrial personal computer. The testing device comprises a short-circuit current branch circuit, a discharge current branch circuit, a test object branch circuit and a direct-current charging power supply branch circuit which are connected in parallel, wherein the test object branch circuit comprises an MOV short-circuit test object; the short-circuit current branch comprises an alternating-current generator and a current-limiting inductor, and is used for inputting short-circuit current to the sample branch by utilizing the alternating-current generator and the current-limiting inductor; the discharge current branch comprises a discharge capacitor and a wave modulation inductor, and is used for inputting discharge current to the sample branch by using the discharge capacitor and the wave modulation inductor; the direct-current charging power supply branch comprises a direct-current charging power supply and is used for charging the discharging capacitor; and the industrial personal computer is used for controlling the operation of the direct-current charging power supply, acquiring the current of the MOV short-circuit test object and generating a current oscillogram according to the current. According to the invention, the most strict assessment effect is achieved, and the explosion-proof performance of the MOV is effectively assessed.

Description

technical field [0001] The invention relates to, in particular, a system and method for testing the MOV explosion-proof performance of a serial compensation device. Background technique [0002] The series compensation device has the advantages of increasing the transmission capacity of the transmission line and enhancing the stability of the system. In recent years, it has been applied in many high-voltage and long-distance transmission lines in my country. The series capacitor bank is the core component of the series compensation device, and a metal oxide voltage limiter (MOV) is usually used as a protection device for the capacitor bank. When a line with series compensation fails, the MOV needs to absorb the energy generated by the short-circuit current while limiting the overvoltage of the capacitor bank under the line fault. Therefore, the design energy of the MOV is very large, generally tens of MJ. Due to the large energy absorbed, the MOV unit generally adopts a mul...

AI Technical Summary

Problems solved by technology

However, the assessment condition of this test only considered the influence of the short-circuit current, and did not consider the influence of the discharge current of the capacitor bank

Even if the MOV has passed the type test required by the national standard, its porcelain casing may also undergo a crushing explosion in the case of MOV breakdown failure

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